Nickel base alloy

ABSTRACT

The alloys of this invention contain relatively small, but nonetheless significant, amounts of tungsten and molybdenum for solid solution strengthening, chromium for oxidation and sulfidation resistance, tantalum for solid solution and carbide strengthening, and aluminum and titanium to enhance the strength by precipitation of a fine dispersed phase, gamma prime Ni3(Al, Ti).

United States Patent [1 1 Dalal et alt I 11 1] 3,793,011 Feb. 19, 1974 NICKEL BASE ALLOY [75] Inventors: Ranes P. Dalal, Stratford; Jeremy J. Walters,Trumbull; Bruce A. Ewing, Shelton, all of Conn.

[73] Assignee: Avco Corporation, Stratford, Conn.

[22] Filed: Nov. 8, 1971 21 Appl. No.: 196,799

[52] US. CL; 75/171, 148/325 [51] Int. Cl. C22c 19/00 [58] Field of Search 75/17l, 170; 148/32, 32.5

[56] References Cited UNITED STATES PATENTS 3,619,182 11/1971 Bieberetal. ..75/l7l 3,322,534 5/1967 Shayv et al. 75/171 Primary ExaminerRichard 0. Dean Attorney, Agent, or Firm-Charles M. Hogan Ni (Al,Ti).

ABSTRACT 5 Claims, No Drawings 1 NICKEL BASE ALLOY This invention relates to nickel base alloys exhibiting Co 8.50-9.50 Mo 1.85-2.05 W 3.65-5.0 Ta 4.5-8.0 Ti 3.90-4.20 Al 3.20-3.60 Ti Al 7.25-7.70 B 0.0l0-0.020 Zr 0.08-0.25

Ni balance Exemplary alloys in accordance with the teachings of this invention had the compositions shown in Table 1 which follows:

TABLE 1 Heat No. C Cr 7 Co Mo W Ta Ti Al TiAl B Zr Ni 1 .17 12.97 9.37 2.05 3.99 4.86 3.98 3.33 7.31 v .014 .12 Balance ll .17 12.97 9.37 2.05 3.99 5.86 3.98 3,33 7.31 .014 .12 Balance 111 .17 12.97 9.37 2.05 3.99 7.86 3.98 4 3.33 7.31 .014 .12 Balance IV .22 12.97 9.37 2.05 3.99 5.86 3.98 3.33 7.31 .014 .12 Balance V .22 12.97 -9.37 2.05 3.99 7.86 3.98 3.33 7.31 .014 .12 Balance V1 .20 12.31 9.18 1.94 3.72 6.70 4.08 3.38 7.46 .014 .15 Balance V11 .17 12.97 9.37 2.05 5.00 4.86 3.98 3.33 7.31 .014 .15 Balance V111 .17 12.97 9.37 2.05 6.00 4.86 3.98 3.33 7.31 .014 .15 Balance Compositions of the following analyses are contem- C 0.30 max. Cr 11-15 Co 8-12 Mo l-2.5 W 3-8 Ti 3.5-4.5 Al 3-4 Ti Al 7-8 After vacuum melting, the alloys noted above were vacuum cast into A inch ASTM test bars (ASTM E8) and subjected to stress rupture testing according to ASTM Standard E139. The test bars were heat treated before testing as follows: heated to 2,050F, held at that temperature for 2 hours then air cooled, then reheated to 1,550F and held at 1550F for 4 hours, then air cooled, then reheated to 1,400F and held at that temperature for 16 hours then air cooled. After the heat treatment described above, stress rupture tests were conducted on cast test bars representative of each of the heats in the heat treated condition at l,400F/95Ksi, 1,400F/ 1001(si, 1,700F/39Ksi and 1,800F/29Ksi. The results are given in Table 11.

TABLE 11 Stress Rupture Test Results (ASTM E139) l400F/95Ksi 1400Fll00Ksi 1700Fl39Ksi 1800Fl29Ks1 Heat Life El Life El Life 151 151 No. (hrs.) (Hrs) (Hrs) (Hrs) IV 102 5 116 s 43 10 Zr 0.05-0.40 Corresponding values for two presently known com- A more preferred range of compositions is as follows (in weight percent):

mercial alloys are appended to Table II for comparison.

lNCO 713C is reported B Ni 0.0 1 Balance 3 4 MAR-M-42l is reported to be an alloy with a nomielevated temperature and consisting essentially of the nal composition of following in weight percent:

c Cr Co Mo w Ch Ti Al Zr B Ni 0.]5 l5.8 9.5 2.0 3.8 2.0 L8 4.3 0.05 0.015 Balance From the results in Table II, the superiority of the al- C 0.10-0.22

i loys of this invention will be readily seen. Cr 12.30-13.50

We claim: Co 8.50-9.50 1. A nickel base alloy exhibiting high strength, ductil- M0 135-205 ity, sulfidation and oxidation resistance and stability at W 3 5 0 elevated temperature and consisting essentially of the Ta 5 fogowngggn weight percent: Ti 2 Al .20-3. Cr 11-150 3 6O Ti Al 7.25-7.70

5 B 0010-0020 0 Zr 0.08-0.25 Ni balance Ti 3.5-4.5 3. A nickel base alloy according to claim 1 which has A] 3-4 25 been heat treated to produce a desired morphology of Ti Al 7-8 carbides and gamma prime. B 4. An article formed of the alloy of claim 1. Zr 0.05-0.40 Ni b l 5. A vacuum cast article consisting of the alloy of 2. A nickel base alloy exhibiting high strength, ductilclam ity, sulfidation and oxidation resistance and stability at UNITED STATES PATENT OFFICE CER'IIFKI A'I E 0 F (10 RRECI [ON February 19, 1974 Patent No. 3793O11 Dated Ranes P. Dalal et a1. Inventor(s) a It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Columns 1 and 2, Table II should appear as shown on the attached sheet.

Signedand sealed this 1st day of October 1974.

(SEAL) Attest:

McCOY M. GIBSON'JR. c. MARSHALL DANN Attesting Officer Commissioner of Patents USCOMM-DC GOING-P69 u.s. GOVERNMENT PRINTING OFFICE: 930

Patent No. 3,793,011 February 19, 1974 I Page 2 TABLE 11 v 'Shuss Rupture Test Results (ASTI I E1 39) 1400F/95Ksi 14nor/1nos 61 1?U0F/39Ksi 1 snow/29x61 1:661 Life 6 21 Life 21 Life :1 Life :1 No. hrs. (1'4 Liirs.) I 1Q Qlrs.l (f4) firs.) m I 6 BS .1o 68 '7 '2 I 5 n 1 19o 5 181 s 6? 11 I I v 5 n 1v 1 102 5 11 6 a '43 1o \i 2A9 s 146 '1 741 s 6 4 149 '1 19s 6 11? s 61 6 v 142 3 Z Y v 14s 6 INC0- v A 713s I 1'6 6 s 4 2n 12 mamm- 421 so 3' 1 20 3. 1s 15 v11 1 .189 v a 133, a 56' -10 1 153 6 136 .10 4. VIII '15s 3 144 I s 56 s 

2. A nickel base alloy exhibiting high strength, ductility, sulfidation and oxidation resistance and stability at elevated temperature and consisting essentially of the following in weight percent: C - 0.10-0.22 Cr - 12.30- 13.50 Co - 8.50-9.50 Mo - 1.85-2.05 W - 3.65-5.0 Ta - 4.5-8.0 Ti - 3.90-4.20 Al - 3.20-3.60 Ti + Al - 7.25-7.70 B - 0.010-0.020 Zr - 0.08-0.25 Ni - balance
 3. A nickel base alloy according to claim 1 which has been heat treated to produce a desired morphology of carbides and gamma prime.
 4. An article formed of the alloy of claim
 1. 5. A vacuum cast article consisting of the alloy of claim
 1. 